[R] Very large family of the order Lepidoptera; adults with relatively large wings (although flight rarely strong) and often laid horizontally when at rest; coloration cryptic; females with greatly degenerate wings in certain genera, e.g. Operophtera; larvae elongate and slender, provided with abdominal prolegs usually restricted to abdominal segments 6 and 10 and progressing with a characteristic looping gait; often twig-mimicking.
The winter moth (Operophtera brumata) is an important pest. See also the willow beauty moth (Boarmia gemmaria) and Gymnoscelis pumilata (on olive).
HYPPZ on line: Species (scientific names), Pests (common names), Glossary, Crops.